Dinaw Mengestu left his native Ethiopia when he was just a toddler, but he still experienced America as an immigrant, and that challenge continues to shape his fiction. Raised in suburban Chicago, he began his career in Washington with a novel set around Logan Circle called “The Beautiful Things That Heaven Bears” (2007). The National Book Foundation and the New Yorker quickly identified him as a rising star. Now an English professor at Georgetown University, Mengestu has just published his third novel, “All Our Names,” a mournful, mysterious tale about an African man who comes to the Midwest on a student visa.

The peculiarities of this novel are clearly intentional. “All Our Names” is an immigrant story from a writer fully conscious that he’s working in a genre as crowded as Ellis Island. Soon after winning a MacArthur “genius grant” in 2012, Mengestu said, “I think American literature is full of immigrant narratives. We know that story quite well. Part of what I’m definitely interested in doing is adding to the complexity and levels of the immigrant narrative in America.” What he presents here is tantalizingly laconic — long on mood, short on details — an attempt to represent the conflicted emotions of someone who has survived the loss of his family, his friends, his country, his identity.

“All Our Names” moves back and forth between a young black man in Africa and a young white woman in America, both narrating their own chapters in an intimate, reflective tone. The time and place are a little hazy, though we begin in Uganda probably in the 1960s, as the “ecstatic promises of a socialist, Pan-African dream” are starting to fade into a long nightmare of civil wars.

We’re accustomed to hearing that coming to America upends an immigrant’s identity but for this narrator that transformation began long before he left the African continent.

“I had thirteen names,” he says. “Each name was from a different generation.” But those ties made him feel locked in a familial prison. Leaving his parents and his village, he took a long bus ride into the capital of Uganda in search of a new, blank life. “I gave up all the names my parents had given me,” he says. “I was no one when I arrived in Kampala; it was exactly what I wanted.” But horrors no one would want soon follow.

We never learn much about this man, except that he wants to be a writer and that he’s read a few Victorian novels many times. Skittish but earnest, he hangs around the university, posing unconvincingly as a radical student. Before long, he attracts the attention of another poor poser, a jocular young man named Isaac who’s preternaturally confident. Full of enigmatic sayings and blithe predictions of impending revolution, he preaches kindness to the homeless and admonishes the rich to change their greedy ways. Isaac and his wide-eyed friend quickly form a devoted bond that seems, if not erotic, at least charged with intense emotion. Isaac leads his companion into little acts of Marxist protest. When privileged students taunt him, he feels only emboldened. When they beat him, he beams with pride. The narrator knows, “We were at heart village boys, ignorant and immature,” but Isaac becomes a campus celebrity and eventually draws his friend into a full-blown resistance movement.

The most moving parts of “All Our Names” show the narrator’s desperate love for his idealistic friend. Isaac is a true believer in liberating the poor from oppression, but the battle he’s fighting quickly corrodes into a rash of atrocities committed against the most helpless. It’s a grim, small-scale version of how people’s movements have repeatedly devolved into fits of paranoia that produce mass graves where none of the bodies has a name. “It was only a matter of time,” the narrator thinks, “before nothing was safe.” Mengestu’s quiet, restrained prose is never more devastating than when he describes wounded refugees being slaughtered by other impoverished villagers amid the chaos unleashed by civil war.

Two striking strategies complicate this story of hope dissolving in blood. First, the narrator knows nothing of what’s happening across the country, and he can barely understand what’s happening to him and Isaac as the rebel leaders degenerate from liberators to monsters. That prevailing sense of ignorance and the implication that they might be shot at any time cast a fog of fear over the narrator’s tale.

But even more unsettling is that every other chapter takes place in a little college town in the American Midwest, where Isaac has become the special friend of a social worker named Helen. They fall in love, but this is a town “which only a decade earlier had stopped segregating its public bathrooms, buses, schools, and restaurants and still didn’t look too kindly upon seeing its races mix.”

The slurs and glares Isaac elicits in this small town are nothing compared to his complete isolation, his total dependence on Helen. For her, though, this exotic young man is a chance to exercise her own long-dormant desire for rebellion.

In the final pages the intensity of Isaac’s devotion and sorrow grows even sharper. This is not an immigrant story we already know quite well.

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